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| - Laser-Induced Fluorescence Study of the S0−S1 Transition of 1- and 2-Perfluoronaphthol ina Supersonic Jet
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| - The S0−S1 transition of 1- and2-perfluoronaphthol (1-FN and 2-FN) has been studied by fluorescenceexcitationand dispersed emission in a continuous supersonic expansion. Eachcompound gives rise at the origin to twodissimilar excitation systems which can be distinguished by theiremission region. While the higher energysystems exhibit both in absorption and in emission the characteristicfeatures of unsubstituted perfluoronaphthalene, the low-energy systems present a different complex patterntypical of a strongly distorted excitedstate. The dispersed fluorescence from 1-FN shows a resolvedresonant structure for both systems, but theemission extends largely toward the red for the excitation of thelow-energy system excitation. The dispersedemission from 2-FN low-energy system is totally diffuse and redshifted, with a maximum at about 4500cm-1 from the excitation. The two absorption spectrahave been tentatively attributed to the presence of theground state cis and trans rotamers correspondingto a different orientation of the OH group with respect tothe naphthalene frame and involving different weak hydrogen bonding ofOH with the neighboring fluorineatom. The spectroscopic properties of each rotamer have been shownto be strongly sensitive to the positionof the weak internal hydrogen bond.
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